Axios

Scientists have discovered a long, narrow canyon being carved under Antarctica's Dotson Ice Shelf. The upside-down feature is half as deep as the 400-meter-thick ice shelf in some places, according to new satellite observations.

Why it's happening: "Unlike most recent observations, we think that the channel under Dotson is eroded by warm water, about 1°C, as it circulates under the shelf, stirred clockwise and upward by Earth's rotation," said Noel Gourmelen from the University of Edinburgh.

Why it matters: Ice shelves hold glaciers together and slow their flow into the ocean, which can add to sea-level rise, so researchers want to better understand how canyons like these form and affect their stability.

Nearly 1,400 companies apply an internal mechanism to price carbon emissions, a jump from 150 just four years ago, according to a report from non-profit group CDP.

Why it matters: The more than eightfold increase shows how seriously corporate America is taking the issue. The internal mechanisms indicate companies are preparing for an eventual external price on carbon, even if that's further off now with President Trump in the White House. It also reflects increasing investor concerns about the risks climate change can bring companies.

The International Energy Agency sees strong potential for some stability in global crude markets next year — if OPEC and Russia re-up their production-limiting deal beyond the first quarter (check out the chart above).

Trains hauling oil and other flammable material should be better and more frequently inspected, a National Academies of Sciences report out Wednesday says.

Why it matters less today: The amount of oil shipped by rail has dropped 77% since its high in 2015.

It can take years for towns and cities to recover from major hurricanes. But as humans labor to restore power and water, tropical ecosystems — some of the most diverse and complex in the world — are also beginning to rejuvenate. Scientists are now taking stock of flora and fauna in this years' storm paths.

Bottom line: There's an immediate and drastic impact on coral reefs, rainforests and their inhabitants. But in some cases, ecosystems can quickly recover from hurricanes because they evolved to withstand these severe storms.